Theano/Theano — pull request #174 by pascanur (2011-10-31 15:53:11+00:00)
Title: Exp approx fast

This introduces a new flag (tensor.fast_exp) which is by default False. If set to True, instead of using the exp function in the C code I use an approximation which is considerably faster and helps when one needs to do softmax over very large layers.